Head-motion.



W. A. STEDMAN.

I Pateted Sept. 14, 1915.

W v I I WEW f I 31 15332&

E Willi m A mor Sfdmar I By W ATTORA/EYS WILLIAM ABMOB STEDMAN, OF WONDEm NEVADA.

HEAD-MOTION.

Spcifioation of Letters Patents.

Application filed January e, 1915; serial No. 3,114.

To all 'whom it may concem:

Be it known that I, WJILIAM ARMOR STEDMAN, a citizen of the United States, and a resident of Wonder, in the County of Churchill and State of Nevada, have in- Vented a new and Improved Head-Motion, of which the following is a full, clear, and' exact description. v

My invention relates to head motions for concentrating tables and has for its object' the provision of@ device as stated which is simple, strong, inexpensive and eflicient and which will reciprocate a concentrating table at variable speeds the maximum of which speed is at one end of the table's travel.

A further object of the invention' is to provide a head motion wherein the length of travel of the table may be`varied and therewith the speed thereof. i

With the above and other objects in View, the nature of which will -more fully appear as the description proceeds, the invention consists in the novel construction, combination and ai'rangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views, and Figure 1 is a side elevation of an embodiment of my invention partly in section and illustrating the device when the same moves at maximum speed; Fig. 2 is a similar view showing the device moving at minimum speed; and Fig. 3 is a similar View of a fraction of the' device when the slide block begins to retract its movement in the arcuated slot of the oscillating or rocking arm.

Referring to the drawings, 4: represents a base havin a pair of alinng lugs 5 which form bearngsor a slide bar 6 which is preferably of angular cross section so that the same is free' to slide but prevented from turning in the bearings of the base. One end of the slide bar is shaped to engage the concentrating table 7. The portion of the bar 6 between the lugs 5 is provided with an elongated slot 8. Provided substantially in the middle of theslot is a guide block 9 mounted to rotate on a pin 10 passing transversely of the slot and restin in the sides thereof.

The block 9 is sldably engaged in the bifurcated end 11 of an oscillating or rocking lever 12. The said lever has the shape of a bell-crank lever one' arm of which is shorter than the' other, the shorter arm having the 'bifurcated end. 'The lever 12 is mounted to rock on a pin 13 at the junction of the two arms The said pin 13 forms part ofa block 14: engaged in a slot of a standard 15. The standard carries a threaded member 16 from which said block 14: is

?atentati se t, M, rere; I

Suspended, whereby the distance between the pins 10 and 13 can be varied; thus, the actng length of the short arm of the bellcrank lever 12 can be varied accordingly.

The long arm of the bell-crank lever has i an arcuated slot 17 the radius of curvature of whch s not` less than the radius of the arc of travel of the crank pin 18 carried by the crank disk 19 which is mounted to rotate on a standard 20 forming, preferably, a

. mounted to rotate in a block 24 fitted to slide in the arcuated slot 17. It is understood that the efl"ective projected length of the arcuated slot 17 is equal to the diameter of the are of travel of the crank pin 18.

As the crank pin revolves in the direction of .the arrow shown in the drawings it will cause the end of the lever 12 connected thereto to rise and fall, while the block 24 will reciprocate in the arcuated slot 17. The shorter arm of the lever 12 will, consequently, oscillate on the pin 13 and transmit its 'movement through the block 9 to the slide bar 6 which 'will reciprocate, and therewith the table 7. As the crank pin moves through the upper half of its revolution its path is along a line substantially concentric with the slot 17, consequently, the longer arm of the lever 12 will be moved up and down through a comparatively short dis- '-tance. That is to say, the short arm of the portionately wi the crank of travel.

It will be noticed that the shorter arm of the lever 12 is at such an angle to the longer arm that when the crank pin is at the highest point, and therewith the longer arm of the lever 12, the line connecting the axes of oscillation of the lever 12 and the pin 10 is perpendicular to the line of motion of the slide bar 6. That is, the center line of the short arm of the lever 12 is perpendicular to the line of motion of the slide bar 6; consequently, when 'the crank pin is. at its highest point, the distance between its axis of oscillation and that of pin 10 is, at minimum. When the crank pin is at its lowest point the line connecting the axis of oscilpin in the lower half of its path lation with the axis of the -pin 10 will not be perpendicular to the direction of motion but at 'an angle thereto (see Fig. 1.), and this will be the maximum distance between the axis of oscillation and the axis of the pin 10.

Since the crank speed is substantially con-- stant, the speed of oscillation of the shorter arm of the lever 12 will gradually increase as the crank pin 18 enters the right half of its path of travel (see Fig. 2.). The maximum' speed is attained when the crank pin 18 reaches its lowermost point (see Fig. 1.).

The'speed of the slide bar 6 is, furthermore,

accentuated by the variation of the distance between the axes of oscillation of .the lever 12 and that of the pin 10 (see Fi 1.). As the crank pin travels in the left alf of its path of travel its speeddecreases until it reaches the right half. That' is to say, the speed of the concentrating table is from minimum to maximum. It is reversed at maximum speed and brought again to the minimum speed. By means of the screw 16 the distance between the axes of oscillation of the lever 12 and the pin 10`mav be varied and, consequentl the length of travel of the table 7 is variedyand therewith the maximum speed, assuming that the speed of the crank pin remains constant.

It may be remarked that my head motion is characterized by the provision of a lever mounted to oscillate to and from a line perpendicular to the line of travel of the table to be actuated; and the speed of oscillation varies proportionately to the angle the lever makes wth the perpendicular distance. That is to say, as the shorter arm of the lever 12 moves away from the perpendicular distance (see Fig.1 2.) its speed increases prot the increase of the angle t makes with a perpendicular dropped from the axis of oscil ation on to the direction of motion of the slide bar 6 (see Fig. 1.).

From the foregoing description, taken in connection with the accompanying drawings, the advantage of the Construction and operation of the device shown will be readily understood by those skilled in the art to which the invention pertains, and while I have described the princple of operation, together with the device which I now consder to be the best embodiment thereof, I desre to have it understood that the device shown s merely illustrative and that such changes may be made as are within the scope of the appended claims.

Having 'thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a head motion for concentrating tables, an arm mounted to oscillate to and from a line perpendicular to the line of travel of said table, means for varying the working length of said arm, means connectng said arm to the table, and means for oscllating said arm at a variable speed increasing as the arm moves from the perpendicular line and decreasing as it moves toward the same. a

2.`In a head motion for concentrating tables, a bell-crank lever having one arm associated with the table, the other arm having an arcuated slot, a crank pin engaging the slot, means for actuating the crank pin -whereby the shorter arm is oscillated at a variable speed, substantially as and for the purpose set forth.

3. In a head motion for concentrating tables, a bell-crank lever mounted to oscillate, means forming a loose connection between one of said arms of said bell-crank lever and the table, means for varying the length of said arm, the other of the arms of the bell-crank lever having an arcuated slot at the end thereof, a crank pin'engaging the slot, and means for actuating the crank pin whereby the bell-crank lever is oscillated at a variable speed substantially as and for the purpose set forth.

4. In a head motion for concentrating tables, a bell-crank lever, one arm of which is loosely connected to the table, the other arm having an arcuated slot, a crank pin engaging said slot, the radius of curvature of said slot being not less than that of the arc of travel of said crank pin, and means for actuating the crank pin.

5. In a head motion for concentrating tables, a bell-crank lever mounted to oscillate and-having a long and a short arm, the

short arm being bifurcated, a slide block in said bifurcated end, a pin rotatably mounted in said block, a slide bar connectin said pin to the table, the longer arm o the bell crank having an arcuated slot at the end thereof, a crank pin engaging the arcuated slot, the radius of curvature of said arcuated slot being not less than the radius of the are of travel of said crank pin, and means for varying the distance of the axis of oscillation of said bell-crank lever from the pin in the block engaged in the bifurcated end.

6. In a head motion for concentrating tables, a base having alining bearing lugs, a bar mounted to slide in said hearing lugs, said bar being connected to the table, said bar having a slot, a pin in said slot, a block bearing on said pin, a bell-crank' lever mounted to oscillate on said base and having a long and short arm, the short arm being bifurcated and engaging said block, means for varying the distance of the axis of oscillation of the bell-crank lever from the pin in the slot, the long arm of the bellcrank lever having an arcuated slot, a crank pin engaging the slot, and means for actuating the crank pin.

7 In a head motion for concentratng tables, a bell-erank lever mounted to oscillate and having one arm loosely attached to the table, the other arm having an arcuated slot, and a crank pin engagng the slot, said arcuated slot being central With the arouatecl path of travel of the pin and the effective projected length of said arcuated slot being substantially equal to the diameter of the circle in which the pin travels.

8. In a head motion for concentrating tables, a bell-crank lever mounted to oscillate and having one arm loosely attached to the table, the other arm having an arouated slot, a crank pin engaging said slot,

and means for actuating said crank pin, the arms of said bell-crank lever being so related that When said leveris actuated by the crank pin the arm connected to the table oscillates to and from a line perp'endicular to the line of travel of said table.

9. In a head motion for concentrating tables, a bell-crank lever mounted to oscillate and having one arm loosely attached to the table, the other arm having an arciated slot, a crank pin engaging said slot, the radius of curvature of said arcuated slot being not less than the radius of travel of said crank pin, means for actuatng said crank pin, and means for varying the distance of the axis of oscillation of the bell crank from its loose connection With the table, the arms of said bell crank being so related that the arm loosely connected With the table is mounted to oscillate to and from a line perpendicular to the direction of travel of said table.

In testimony whereof I have signed my name to thisspecificaton in the presence of two subscribing witnesses.

WILLIAM ARMOR STEDMAN.

Witnesses:

EDGAR JOHN LoRToN, WILLIAM HENRY MANNNG. 

